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A. H. DIXON 8v W.. .'GRADWELL. STOP MOTION MBGHANISM E OUBLING- FRAME No. 358,257.Y l Patented Feb. 887.

N. PETERS. Fhclo-Lhagrnphur. Washi nnnnnn C.

(No Model.) i l @sheets-'sheet 2. A. H. DIXON 8v W- J@ GRADWELL. STOP MOTION MEOHANISM FOR DOUBLINO FRAMES, Ow.

N0.358,257. Patentedebzz, 18s-7.

N. PETERS, Pnnwulhogmpher. washi nnnnnnn C,

UNITED STATES ALFRED HERBERT DIXON AND VILLIAM JAMES GRADVELL, OF

I PATENT EEiCE.

MANCHES- TER, COUNTY or LANCASTER, ENGLAND.

SPECIFICATION forming part of Letters Patent No. 358,257, dated February 22, 1887.

Applica-tion led April 1-1, 1886. Serial No. 198,819. (No model.) Patented in England September 4, 1885. N0.10,46G.

To @ZZ w/toml it may concern:

Be it known that we,l ALFRED HERBERT DIXON and WILLIAM JAMES GRADwELL,sub jects of the Queen of Great Britain and Ireland, and residing at Manchester, county of Lancaster, England,have invented certain Improvements in Stop-Motion Mechanisms for Doubling and Twisting Frames, (for which we obtained a patent in Great Britain, No. 10,466, dated September 4L, 1885,) of which the following is a specification.

Our invention relates to means for arresting the rotation of the top roller in the frames used `in the doubling and twisting of yarn at the times when the yarn breaks, in order to prevent the waste which arises from the yarn coiling upon the said roller, as is well understood, or from becoming attached to adjacent yarns, so as to forni three or four fold or lashed ends.

Figure 1, Sheet l, represents a sectional side view,and Fig. 2 a front view, of our apparatus with the parts in the normal positions which they retain so long as'the yarn represented by z does not break. Fig. 3 corresponds with Fig. 1, with the exception that thev parts are represented in the positions assumed on the breakage of the yarn. Fig. 4: is a sectional View of the rollers, rod, and a swing-frame, which appear in Fig. 3.

In the said gures, a is the bottom roller; b, the top roller. c is the aforesaid swing-frame, and d is the stop-catch lever. The said swingframe is forked at its lower end to rest upon a rod, e, which extends in front of the bottom roller from one bearing-standard to another, and is provided with a back rest, e', which supports the swing-frame when it is thrown over on the breakage of the yarn.

During the regular working theswing-frame is supported by reason of its front end resting on the guide-rail f. The swing-frame is formed with bearing-grooves to receive the journals of the top roller, asin the case of the ordinary cap-bar.

The stop-catch lever dis pivoted to the swingframe at d in such a manner that the said lever is free to turn upon its pivot with a slight degree of friction. One end of this stopoatch lever is provided with a projecting linworking the guide is held down.

ger, which carries a glass yarn-guide, g, and the said lever is so balanced upon its pivots as that the end which carries this yarnguide has a tendency to rise. The yarn on its Way from the rollers to the spindle passes over this yarn-guide, and the tension of the yarn is sufficient to overcome the said tendency of the yarn-guide to rise, so that during the regular The stopcatch lever is formed with a tooth or catch, d,

and the bottom roller is provided with projecting studs, teeth, or pins lzy 7i, or it might be depressions. So long as the yarn-guide gis held down by the yarn the tooth d2 clears the studs 7L as they are carried past it by the revolution ofthe I'oller. An arm, i', is hinged by itslower endto the swing-frame. By preference we make this arm of wire, and bend one end so that it will enter and turn inca hole drilled in the swing-frame. W'e may, however, make this arm of any suitable material or shape. Vh'en this arm is turned over from its position indicated by the full lines, Fig. 1, it rests upon the stop-catch lever, as indicated by the dotted lines, and its weight is sufficient to keep down the thread-guide g in the absence of the arn. y The action of the parts is as follows: So long as the yarn z continues intact the parts remain in the position as indicated in Fig. 1. On the breaking of the yarn the stop-catch lever moves into the position indicated by the dottedlines in Fig. 1, whereby the tooth d2 is lowered, so that one of the studs 7i will strike the'said tooth,and the swing-frame will thereby be pushed over into the, position shown in Figs. 3 and 4. When the swing-frame has been so pushed over, one ofthe studs 7i strikes the extreme end of the stop-catch lever, and by raising the same lifts the tooth d2 clear, supposing the said lever to be left in the position indicated by the dotted lines in Fig. 3; but in practice the impetus given to the swing-frame when it is pushed over causes the arm i to swing outward and to fall upon the outer arm of the stop-catch lever, which is thereby sustained clear of the bottom roller in the position indicated by the full lines in Fig. 3.

Then the swing-frame is pushed over,it lifts the top roller clear away from the bottom roller, but the journals of the latter drop in their bearing-recesses until the roller is sustained by a cross-bar, c', which forms part of the swing-frame, the rotation of the roller being at once arrested, and as the yarn passes between the roller and this cross-bar the yarn is nipped and held between the roller and the bar, as indicated in Fig. 4, so that it is prevented from iallinguponthe bottom roller and wrapping around the same. By being thus nipped the broken yarn end is also prevented from becoming attached to the yarn on either side, whereby the formation of three or four fold or lashed ends is prevented7 and also by the yarn being kept lapped around the top roller and the end retained in position for the operator to piece up readily there is less loss of time than in ordinary eases of breakage. Then the swing-frame is restored to its normal position at the time of piecing, the arm 17 is permitted to rest upon the stop-catch lever,

so as to keep the tooth d2 clear of the studs until the tension of the yarn is sufiieient for the purpose, when the said arm is lifted up, so that it rests upon the swing-frame,as in Fig. l.

Referring to Sheet 2 of the drawings, Figs. 5, G, and 7 illustrate a modification adapted for cases wherein the bottom roller runs in a direction contrary to the example shown on Sheet 1. ln this instance the tooth on the stopeateh lever is kept clear of the studs on the bottom roller by the yarn passing below a finger, L', upon the said lever, and the rod c is iixed behind the bot-tom roller,instead of in front of the same. The yarn on its way to the roller passes over a fixed guide, Z, and below a iin-l ger7 m, upon the lower part of the swing-f rame. \Vhen the swing-frame is pushed over on the breakage of the yarn,the parts assume the positions indicated in Fig. 6, and the yarn is nipped between t-hc iingcr m and a xed part, a, which projects from the rod c and carries the guide Z.

To obyiate the difficulties in piecing which exist when the yarn is led under the linger It, we maylead the yarn over a guide, y, as shown in dotted lines at Fig. 5, the guide g being pivoted at .con an extension of the swing-frame c and weighted at ff. Vhen the yarn breaks, the guide falls inward and the tail g is moved clear of the catch (I, which drops or is pushed into contact with one of the studs 71, whereby" the swing-frame c is raised. lVhere it is found desirable to lock the catch d clear of the studs 71, so as to keep the catch d uplifted when the spring-frame is replaced, we may form a stop, '11', as shown in dotted lilies in Figs. 5 and on the arm i, the said stop dropping into a notch in the catch d. This locking arrangement will be found useful to prevent premature knocking off7 in cases where the yarn becomes slack when the frame is stopped.

A modification of our stop-motion, which we use in eases wherein the ordinary cap-bar is retained, is illustrated by Figs. 8 and l0. In this example the top rolleris kept in position by the cap-bar o, and the upper end of the swing frame rests against this cap bar. Hinged to the swing-frame is a lifting-bar, p, which is represented in plan in Fig. 10, and in the example is made of wire,and is cranked so that one part, p', rests in holes drilled in the swing-frame, and another part, p2, extends parallel with the part Ip and with the axis 0f the rollers. The free or tail end of the bar rests upon the rail f, and is formed with a bend or elbow, which comes in contact with a stop,

1, when the swing-frame is pushed over, and thereby limits the movement of the swingframe. \Vhen the yarn breaks, the swingframe is thrown over, as in the examples already described, and the bar p is thereby drawn forward, so that the part p comes between the two rollers and raises the top roller, as indicated in Fig. 8. IThe rotation of the top roller is thus at once arrested, the bar p acting as a brake, and at the same time the yarn is nipped between the roller and the bar. This bar p thus performs substantially the same function in raising, arrest-ing, and sup porting the top roll as does the bar e', Fig. 4, in the construction above described.

Fig. 1l illustrates an alternative method of limiting the swinging-over movement of the swing-frame and at the same time of nipping the yarn. In this construction the yarnisled through a notched plate, r', through which also passes the rod p, provided with an enlargement, r'i, in such a position that when the swing-frame is thrown back on the breaking of a strand the enlargement r2 will come into contact with the plate r, and at the same time grip and hold the yarn against the plate.

1n any of the examples there may be only one stud or tooth on the bottom roller, or any desired number other than the indication,and recessed teeth may be formed in the bottom roller in lieu of the projecting teeth. If desired, a toothed ring may be applied to' the bottom roller7 as indicated in Fig. 9.

In treating very fine counts ef yarn we have sometimes found that unless the nipping-surfaces are so exactly finished as to be in contact at all points in their breadth suchiine yarn is not always nipped andheld7 and is allowed to lap on the roller. To obviate this we make one of the nipping-surfaces-such, for example, as that shown in Figs. 5 and G-so that it shall rock in its support and accommodate itself to the opposite nipping-surface. For example, in Figs. l2 and 13 a nipping-block, k, is formed with a rounded back, and has a shank, 7.1, which loosely enters a hole in the part a, the looseness of its iit allowing it to yield slightly to one side or to the other. When the swing-frame is thrown up, the partm comes into contact with the said rocking nippingbloek k2, which yields to one side or the other, so as to obtain equal contact throughout their entire length, so that at whatever point the yarn may beit will be nipped and held. It will be evident that such a rocking contactsurface might be applied to the swing-frame instead of to the part a.

IOO

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By providing the lower roller with stop projections, and combining therewith the swingframe with its pivoted catch-lever and devices to support the upper roller clear of the lower one, when a yarn breaks l obtain a simple, compact, and effective stop-motion.

We claim as our invention- 1. The combination of the toproller and lower roller, the latter having projections on its periphery, with a swing-frame carrying a pivoted catch-lever adapted to come into contact with the projections on the lower roller when a yarn breaks, and devices, substantially as set forth, whereby the upper roller is supported clear of the lower roller, all substantially as described.

2. The combination of the top and lower rollers, the latter having projections on its periphery, with a swing-frame in which the top roller is mounted, a pivoted catch-lever carried by the swing-frame and adapted to come into contact with the projections on the lower roller when the yarnbreaks, and thereby move the swing-frame over with the upper roller clear of the lower one, all substantially as described.

3. rlhe combination 'of the top and bottom rollers, the latter having projections on its periphery, with a swing-frame, in which the top roller is mounted, a pivoted catch-lever carried by the swing-frame, and a pivoted arm, t',

on the swing-frame, to act as a counter-weight, all substantially as specified.

4. The combination of the top and bottom rollers, the latter having projections on its periphery, with a swing-frame, in which the top roller is mounted, a pivoted catch-lever carried by the swing-frame, and a pivoted arm, fi, carrying a stop, i', to engage with the said catch-lever, substantially as and for the purpose described.

5. The combination of the upper and lower rollers, the latter having projections on its periphery, with a swing-frame, e, carrying the upper roller, a catch-leverpivoted to the swingframe, and a cross-bar, o', on the latter, with which the upper roller can come into contact on the breaking of a yarn to grip the broken end, all substantially as set forth.

6. A stop-motion provided with nippingsurfaces for the broken end, one of said nipping-surfaces consisting of a self-adj usting block, k, substantially as set forth.

In testimony whereof We have signed our names to this specification in the presence of two subcribing witnesses.

ALFRED HERBERT DIXON. VILLIAM JAMES GRADWELL.

Witnesses:

WM. SwINGs, C. CHADWIOK. 

